Create Concurrency README.md

Author: ElizaLo

Concurrency in Python/README.md

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+# Concurrency
+
+In Python, the things that are occurring simultaneously are called by different names (thread, task, process) but at a high level, they all refer to a sequence of instructions that run in order.
+
+# 📰 Articles
+
+- [Speed Up Your Python Program With Concurrency](https://realpython.com/python-concurrency/)